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CVE-2024-13926: WP-Syntax WordPress Plugin Catastrophic Backtracking Vulnerability

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Overview

This report discusses the vulnerability CVE-2024-13926, which affects the WP-Syntax WordPress plugin version 1.2 and earlier. This vulnerability could potentially lead to a Denial of Service (DoS) attack due to a catastrophic backtracking issue in regular expression processing. It’s significant because of the potential for system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2024-13926
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage due to DoS attacks

Affected Products

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Product | Affected Versions

WP-Syntax WordPress Plugin | Version 1.2 and earlier

How the Exploit Works

The vulnerability resides in the improper handling of user input within the WP-Syntax WordPress plugin. An attacker can create a post containing a large number of tags, which triggers a catastrophic backtracking issue in the regular expression processing. This could lead to a Denial of Service (DoS) attack, potentially rendering the system unavailable or leaking sensitive data.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability using a large number of tags in a WordPress post:

POST /wp-admin/post-new.php HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
post_title=Exploit&content=[place large number of tags here]&post_status=publish

In the above example, the ‘content’ parameter is filled with an excessive number of tags, causing the WP-Syntax plugin to backtrack excessively during regex processing, leading to a DoS condition.

Mitigation

Users of the WP-Syntax WordPress plugin are advised to apply vendor patches as soon as they become available. In the interim, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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